I have a Tonga hot tub from Leisure Spas. I want to program the heating cycles as it implies in the manual. Page 15 of manual says "Economy Mode operates the heater only during programmed Heating Cycles (See "Setting Heating Cycles" below)" Only problem is there is no section on "Setting Heating Cycles" so I have no idea how to program the heating times. I searched the internet high and low with no luck. Does anyone know how to do this or even how to contact this manufacturer? Any help would be greatly appreciated.

ah I see, so the manual is somewhat misleading. I guess this means it will heat/filter for 2, 4, or 6 hrs per 12 hrs (or continuous) as per the filter settings on pg15 of the manual. No way to set actual time (just duration). That's too bad as I was hoping to have it heat during the evening (when its used and when hydro is cheaper) instead of during the day. Oh well. Thank you very much for the info.

When you first power up the spa the internal time clock will begin working keeping track of the 12 hours between cycles. So what you could do is shut the power off in the evening when you would like the filter cycles to begin. This will reset the internal clock and should have your evening cycle start at that time and then run for however long or which filter cycle mode you have it set on. Then 12 hours later the second cycle would begin.